What is a P&ID in paper mill design?

A P&ID is an engineering drawing showing how paper mill process equipment, pipelines, valves, instruments and control loops are connected and intended to operate.

What is the difference between a PFD and a P&ID?

A PFD shows the major process sequence and principal flows, while a P&ID adds detailed piping, valves, instruments, controls, drains, vents and operating provisions.

Which paper mill systems require P&ID diagrams?

P&IDs may be required for stock preparation, approach flow, chemical dosing, vacuum, steam and condensate, water circuits, utilities and effluent treatment.

Does a P&ID show the physical routing of a pipeline?

No. A P&ID shows functional process connections. Physical routing, elevation, supports and spatial arrangement are developed through layouts and piping drawings.

Why are interlocks important in paper mill P&IDs?

Interlocks help prevent dry running, overflow, incorrect chemical dosing, equipment damage, unsafe operation and operation without required utilities.

Can an operating paper mill prepare P&IDs retrospectively?

Yes. Existing mills can develop as-built P&IDs through site surveys, operator discussions, equipment verification and review of control-system and engineering records.

P&ID Diagrams for Paper Mill Design: Process, Piping, Controls and Engineering Review

Dr. Anubhav Gupta
Nov 16, 2023
0 min read

Updated: 23 hours ago

P&ID Diagrams for Paper Mill Design: Process, Piping, Controls and Engineering Review

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